Writing instrument



FIG. 1 is a side view of my design for a writing instrument;

FIG. 2 is a side view thereof in the open position;

FIG. 3 is a side view of writing instrument rotated 90 degrees from FIG.1;

FIG. 4 is a side view of the writing instrument rotated 90 degrees fromFIG. 3;

FIG. 5 is a side view of the writing instrument rotated 90 degrees fromFIG. 4;

FIG. 6 is a rear end view of the writing instrument; and,

FIG. 7 is a front end view of the writing instrument.

The ornamental design for a writing instrument, as shown and described.